(Al-Hijr) 15 : 38
إِلَىٰ يَوْمِ الْوَقْتِ الْمَعْلُومِ
“Until a well-known fixed Day".
Satan had requested for respite until Day of Judgment, but the Impartial Lord has given him respite until a well-known Day. I.e. until the day when Satan in the form of pseudo-prophet Antichrist will be killed by the second coming of Jesus as explained in verses 4: 158-159. After that, Heavenly life (Islamic life) will be implemented on earth under the leadership of Jesus. Then mankind will lead a life like Angels without having sexual ambitions and discriminations as told in verses 43: 60-61. See explanation 7: 15.